耦合三端子量子点系统中Andreev反射调控的热电输运  

Andreev Reflection Modulated Thermoelectric Transport in a Three Terminal Quantum Dot

作　　者：郝方原 王瑞强[1] 

机构地区：[1]华南师范大学物理与电信工程学院广东省量子工程与材料重点实验室,广州510006

出　　处：《华南师范大学学报（自然科学版）》2014年第1期37-41,共5页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(11174088);教育部新世纪优秀人才项目(NCET-10-0090)

摘　　要：以耦合到超导电极、铁磁金属电极及正常金属电极的三端子量子点混杂系统为研究对象,系统研究了自旋极化电子的Andreev反射过程对热电流的影响.研究发现,Andreev反射过程及正常的隧穿过程2种机制的竞争不仅导致热电荷流大小和方向的改变,而且导致热自旋流大小和方向的改变.可通过调控门电压及超导体与量子点耦合强度实现.The influence of spin-polarized electronic transports associated with Andreev reflection on the thermoe- lectric currents is investigated in a three-terminal hybridized system, consisting of an interacting quantum dot tunnel coupled to one superconducting, one ferromagnetic, and one normal lead. The numerical results show that the com- petition between the Andreev reflection and normal tunneling leads to the changes in the magnitude and direction of both thermal charge current and thermal spin current. Experimentally, it can be realized by modulating the gate voltage and the coupling strength between the superconducting lead and quantum dot.

关 键 词：Master方程 ANDREEV反射 热电输运 藕合三端子量子点 

分 类 号：O469[理学—凝聚态物理]